About the remained RAM size

jabadiagm / MSXgoauld_tn20k

MSX Goa'uld board with Tang Nano 20k

GNU General Public License v3.0

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About the remained RAM size #5

Closed YouInSun closed 4 months ago

YouInSun commented 4 months ago

Hello, I applied your solution with GoldStar FC-200 and the remained memory shows about 12Kbytes even the original machine gets 24Kbytes. Could you let me know any possibility shows the size? Note: I programmed the No. 5 option which has all options(bios sound and mapper)

Thank you for your reply in advance.

jabadiagm commented 4 months ago

Hi,

I’m sorry, this means firmware is not stable in your tang, different tangs behave differently, still don’t know the reason why.

Until a fix is found, please try a version without mapper (01, 02, 03).

Enviado desde mi Alcatel OT511

El 19 feb 2024, a las 4:03, SunChip @.***> escribió:

Hello, I applied your solution with GoldStar FC-200 and the remained memory shows about 12Kbytes even the original machine gets 24Kbytes. Could you let me know any possibility shows the size? Note: I programmed the No. 5 option which has all options(bios sound and mapper)

Thank you for your reply in advance.

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YouInSun commented 4 months ago

Hi,

Thank you for your response however I've got a hint to restore remained memory. When I connected 5v power to the Tang Nano's USB-c port, I've got increased memory. (about 28KBytes)

For your information! Regards.

YouInSun commented 4 months ago

However, If 4MB mapper is correct, my understanding is that the remained memory would not be 28KB...

jabadiagm commented 4 months ago

Hi,

that’s correct. The thing is, Basic can only deal with 28815 bytes maximum, even with a 4 MB mapper. To check total memory, use a tool like testram in MSX-DOS:

https://msxhub.com/TESTRAM

Enviado desde mi Alcatel OT511

El 21 feb 2024, a las 16:09, SunChip @.***> escribió:

However, If 4MB mapper is correct, my understanding is that the remained memory would not be 28KB...

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YouInSun commented 4 months ago

Thank you for your explanation! I will check the tool if I have MSX-DOS.

Regards.